2024-2025 Jeep Compass P0115-00 ECT Sensor Malfunction

Important Warning for US Owners

This Technical Service Bulletin (TSB) 08-115-26 is explicitly not applicable to vehicles built for the US market. It is intended for vehicles sold in India and Asia Pacific regions. Owners in the US experiencing similar symptoms should consult their local dealership for diagnosis specific to their market.

Symptoms of an ECT Sensor Malfunction

Owners of affected 2024-2025 Jeep Compass vehicles may experience several indicators of an Engine Coolant Temperature (ECT) sensor malfunction. The primary symptom is the illumination of the Malfunction Indicator Lamp (MIL) on the dashboard. This is typically accompanied by a specific Diagnostic Trouble Code (DTC).

Additionally, drivers might notice an "Engine overheating warning lamp indicator is illuminated on the Instrument Panel Cluster (IPC)". This warning suggests that the engine's cooling system may not be functioning correctly, or that the sensor providing temperature data is faulty.

Fault Codes / DTCs

The primary Diagnostic Trouble Code (DTC) associated with this issue is:

Code	Description	Module
P0115-00	Engine Coolant Temperature Plausibility Check	Engine

This P0115-00 code indicates that the engine control module has detected an implausible signal from the ECT sensor, suggesting a potential problem with the sensor itself or its circuit.

Diagnosis and Trigger Conditions

The root cause of this issue is identified as an Engine Coolant Temperature (ECT) sensor that is not properly soldered. This manufacturing defect can lead to inaccurate temperature readings, triggering the warning lights and DTC P0115-00.

To diagnose the problem, technicians will use a Scan Tool, such as wiTECH or an equivalent system. They will verify that all related systems are functioning as designed. If a customer's vehicle VIN is listed in the Rapid Service Update (RSU) 26-049 list, the repair procedure outlined in this bulletin should be performed. If the VIN is not on the list but the vehicle exhibits the described symptoms, the repair procedure is still applicable.

Repair Procedure Summary

Technical Service Bulletin 08-115-26 outlines a procedure focused on inspecting and potentially replacing the faulty Engine Coolant Temperature (ECT) sensor. The repair involves several steps:

1. Access: The technician begins by removing the battery tray to gain access to the engine components.
2. DPF Sensor Removal: The Diesel Particulate Filter (DPF) pressure sensor bolt is removed, and the sensor is carefully positioned aside to allow access to the ECT sensor.
3. ECT Sensor Disconnection: The wire harness connector for the ECT sensor is disconnected.
4. ECT Sensor Removal: The existing ECT sensor is then removed from its housing.
5. Batch Code Inspection: A critical step involves inspecting the batch code located on the brass nut of the ECT sensor. The technician checks if this batch code matches any of the problematic codes: 25W10, 25W36, or 25W37.
6. Replacement Decision: If the batch code matches one of the identified problematic codes, a new ECT sensor (part number MOPAR - 68122824AA or EMEA - 55203964) is obtained and installed. The new sensor is tightened to 22 N·m (16 ft. lbs.). If the batch code does not match, the bulletin is considered complete, and the inspection labor operation (08-14-20-9A) is used.
7. Reassembly: The DPF pressure sensor is reinstalled and tightened to 9 N·m (80 in. lbs.). The battery tray is then reinstalled.
8. Coolant Top-off: If necessary, the cooling system is topped off with Mopar Antifreeze/Coolant (part number MOPAR - 68163848GB or EMEA - 59114709).
9. DTC Clearance: Finally, all Diagnostic Trouble Codes (DTCs), including the Jeep Compass P0115-00, are cleared from the vehicle's system.

Required Tools or Parts

To perform the repair described in TSB 08-115-26, technicians will need the following:

• Scan Tool: wiTECH or an equivalent diagnostic tool.
• ECT Sensor: MOPAR - 68122824AA (or EMEA - 55203964) for replacement.
• Antifreeze/Coolant: MOPAR - 68163848GB (or EMEA - 59114709) for topping off the cooling system.

Owner Action

If you own a 2024-2025 Jeep Compass (specifically models for India & Asia Pacific markets) and experience a Malfunction Indicator Lamp (MIL) illumination, the DTC P0115-00, or an "Engine overheating warning lamp indicator is illuminated on the Instrument Panel Cluster (IPC)", it is recommended to contact your authorized Jeep dealership. Mention Technical Service Bulletin 08-115-26 or Rapid Service Update 26-049. The repair, if applicable, is reimbursable within the provisions of your vehicle's warranty.

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Source: NHTSA ID: 11030208